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Boris Kotzev
From Bulgaria 04:41 AM (GMT+03:00)
$95,000/yr

Active over a week ago


Member since Mar 2026

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Senior Scala Developer

Back-end Engineer
Available for hire
Years of experience
8+ years
Experience level
Senior
Available for
Full-time
Download Resume / CV

I have been building scalable backend systems with Scala for over 10 years, specializing in the Typelevel ecosystem (Cats Effect, FS2, http4s) and Big Data technologies like Apache Spark and Kafka. I have achieved significant results across multiple companies — from architecting microservices that process clinical data from scientific journals, to leading Scala version migrations that improved performance and maintainability, to migrating cloud infrastructure on AWS for better scalability and control. I am looking for a challenging Scala role where I can design high-throughput distributed systems, mentor fellow engineers, and continue pushing the boundaries of functional programming in production environments. What sets me apart is my combination of mathematical thinking with hands-on engineering expertise across the full stack.

Employment History

Consultant Developer at Estafet Current 2022 - Now
Architected and developed scalable microservices for processing clinical data from scientific journals. Used Big Data technologies (Apache Kafka, Apache Spark) for high‐volume data pipelines. Managed cloud infrastructure on AWS, using Databricks and Kubernetes for orchestration. Technology Stack: Typelevel (Cats Effect, FS2, http4s) and Kafka Streams.
Scala Developer at Sentiment 2021 - 2022
Designed and implemented backend microservices for collecting and processing real‐time Social Media messages. Successfully migrated legacy microservices from Scala 2.11 to Scala 2.13, improving performance and maintainability. Technology Stack: Typelevel (Cats Effect, FS2, http4s), SQL, Slick, doobie.
Software Engineer at Ocado Technology 2018 - 2021
Developed and maintained critical microservices for the processing and delivery of customer orders. Led the migration of backend services from Scala 2.12 to Scala 2.13, ensuring code modernization. Migrated deployment infrastructure from AWS Elastic Beanstalk to AWS EC2 to improve control and scalability. • Technology Stack: Scala, DynamoDB, SQS, SNS, Akka Http. ScaleFocus Ltd.

Education

PhD in Mathematics at Purdue University 1995 - 2001
MSc in Mathematics at Sofia University “St. Kliment Ohridski” 1983 - 1988